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Lanthanum is often placed in the d-block of the Periodic Table because it is the first element in the f-block series, specifically the lanthanides, but it exhibits a configuration that allows it to be associated with d-block elements. Its electron configuration ends with 5d¹, meaning it has an electron in the 5d subshell, which is characteristic of d-block elements. Furthermore, it can form similar bonding and oxidation states as transition metals, justifying its placement alongside them in certain contexts. However, it is technically classified as an f-block element due to its role in the lanthanide series.

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AnswerBot

6d ago

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